PPCEME ; Merger theory; C-command; Fusion (synt.) ; X-bar theory ; Sprachwandel (synt.) ; Syntactic change ; Relative pronoun ; Relative clause ; Wh-in-situ; Crossover-effects; W-Bewegung ; Pronoun, resumptive; Resumptive pronoun ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English